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Table 1 Pair-wise comparison of results from different serological tests

From: Assay dependence of Brucella antibody prevalence in a declining Alaskan harbor seal (Phoca vitulina) population

A

 

UAF card neg

UAF card pos

Total

 

cELISA neg

57

1

58

 

cELISA pos

19

15

34

 

Total

76

16

92

  

NPA: 75

PPA: 93

TPA: 78

 

McNemar’s chi2: 14.45

p < 0.001

B

 

UAF card neg

UAF card pos

Total

 

plate neg

24

0

24

 

plate pos

53

16

69

 

Total

77

16

93

  

NPA: 31

PPA: 100

TPA: 43

 

McNemar’s chi2: 51.01

p < 0.001

C

 

UAF card neg

UAF card pos

Total

 

CSU card neg

75

3

78

 

CSU card pos

2

13

15

 

Total

77

16

93

  

NPA: 97

PPA: 81

TPA: 95

 

McNemar’s chi2: 0

p > 0.1

D

 

plate neg

plate pos

Total

 

cELISA neg

20

38

58

 

cELISA pos

4

30

34

 

Total

24

68

92

  

NPA: 83

PPA: 44

TPA: 54

 

McNemar’s chi2: 25.93

p < 0.001

E

 

plate neg

plate pos

Total

 

CSU card neg

23

55

78

 

CSU card pos

1

14

15

 

Total

24

69

93

  

NPA: 96

PPA: 20

TPA: 40

 

McNemar’s chi2: 50.16

p < 0.001

F

 

cELISA neg

cELISA pos

Total

 

CSU card neg

55

22

77

 

CSU card pos

3

12

15

 

Total

58

34

92

  

NPA: 95

PPA: 35

TPA: 73

 

McNemar’s chi2: 12.96

p < 0.001

  1. The results for two tests were compared for all samples to determine relationship between results of different tests. Test agreement is represented as negative (NPA), positive (PPA) and total (TPA) predictive agreement. Results for the McNemar’s Chi2 test are represented as Chi2 and the corresponding p value for 1 df. Assays for B. ovis and B. canis results are not included here.